WO2021120192A1

WO2021120192A1 - Method for processing random access procedure, and terminal device

Info

Publication number: WO2021120192A1
Application number: PCT/CN2019/127104
Authority: WO
Inventors: 石聪
Original assignee: Oppo广东移动通信有限公司
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2021-06-24
Also published as: CN114762412A; US20220322424A1; EP4080955A4; EP4080955A1

Abstract

The present application relates to a method for processing a random access procedure and a terminal device. The method is applied to a terminal device. In a non-contention random access procedure satisfying a predetermined condition, upon receipt of a random access response (RAR), if there is no data to be uplink transmitted, then no uplink transmission is performed. The embodiments of the present application are able to reduce unnecessary uplink transmission interference without affecting a random access procedure.

Description

Processing method and terminal equipment for random access process

Technical field

This application relates to the field of communications, and more specifically, to a processing method and terminal device for a random access procedure.

Background technique

Random Access (RA) is an important step in establishing a communication link between a terminal device and a network device, and it usually includes two random access methods: competitive random access and non-competitive random access. In the competitive random access mode, different terminals can use the same resources to access the network, thus resulting in resource competition; in the non-competitive random access mode, the system can allocate specific resources to designated terminals for use, so No resource competition is required.

Generally, in some cases, the network side can trigger the non-competitive random access process of the terminal device through high-level signaling, for example, when the terminal switches from the serving cell to the target cell, the terminal does not obtain uplink synchronization and the downlink data arrives. Trigger the non-competitive random access process of the terminal equipment.

However, according to the current processing method, in the non-competitive random access process, the terminal still sends data to the network side without the need for uplink transmission data, causing unnecessary uplink transmission interference.

Summary of the invention

In view of this, the embodiments of the present application provide a processing method and terminal equipment for a random access process. By canceling the uplink transmission during the non-competitive random access process, the random access can be reduced without affecting the random access. Necessary uplink transmission interference.

In the first aspect, an embodiment of the present application provides a processing method for a random access process, which is applied to a terminal device, including: in a non-competitive random access process meeting predetermined conditions, after receiving a random access response RAR , If there is no data to be transmitted upstream, no upstream transmission will be performed.

According to the processing method for the random access process according to the embodiment of the present application, the predetermined condition includes: the non-contention random access process is initiated by the physical downlink control channel PDCCH indicating order.

According to the processing method for the random access process according to the embodiment of the application, the predetermined condition includes: the non-contention random access process is initiated by the PDCCH order, and the random access preamble index indicated in the PDCCH order Not zero.

According to the processing method for the random access process according to the embodiment of the present application, the media access control MAC entity of the terminal device is configured to have a function of ignoring uplink transmission.

According to the processing method for the random access process according to the embodiment of the present application, the non-uplink transmission includes: the terminal device grants the UL grant indicated to the HARQ entity in the RAR for the hybrid automatic repeat request HARQ entity Ignore the upstream transmission.

According to the processing method for the random access procedure according to the embodiment of the present application, the UL grant indicated to the HARQ entity in the RAR is addressed to the random access radio network temporary identifier RA-RNTI.

According to the method for processing a random access process according to an embodiment of the present application, the method further includes: in response to a non-competitive random access process triggered by a network device, the terminal device sends a random access preamble to the network device ; Receive the RAR sent by the network device; determine that the random access preamble identifier in the received RAR is consistent with the preamble index corresponding to the random access preamble sent to the network device.

According to the processing method for the random access process according to the embodiment of the present application, the MAC entity of the terminal device is configured to have a skipUplinkTxDynamic field, and the value corresponding to the field is true.

According to the processing method for the random access procedure according to the embodiment of the present application, the method further includes: the MAC entity of the terminal device does not generate a MAC protocol data unit PDU for the HARQ entity.

According to the processing method for the random access process according to the embodiment of the present application, the data to be transmitted in the uplink includes: uplink data, MAC CE, and/or padding data that the terminal device needs to send.

In the second aspect, the embodiment of the present application also provides a processing method for random access process, which is applied to a terminal device, the MAC entity of the terminal device is configured to have a skipUplinkTxDynamic field, and the value of the field is true; The method includes: in the random access process initiated by the PDCCH order whose random access preamble index is not zero, in the case that the UL grant indicated to the HARQ entity is addressed to the RA-RNTI, the terminal equipment The MAC entity does not generate MAC PDUs for HARQ entities.

In a third aspect, an embodiment of the present application also provides a terminal device, including an uplink transmission processing unit, wherein the uplink transmission processing unit is used for receiving random access in a non-competitive random access process that meets predetermined conditions. After responding to the RAR, if there is no data to be transmitted in the uplink, no uplink transmission is performed.

According to the terminal device of the embodiment of the present application, the predetermined condition includes: the non-contention random access process is initiated by the physical downlink control channel PDCCH indicating order.

According to the terminal device of the embodiment of the present application, the predetermined condition includes: the non-contention random access process is initiated by the PDCCH order, and the random access preamble index indicated in the PDCCH order is not zero.

According to the terminal device of the embodiment of the present application, the media access control MAC entity of the terminal device is configured to have a function of ignoring uplink transmission.

According to the terminal device of the embodiment of the present application, wherein the uplink transmission processing unit not performing uplink transmission includes: the uplink transmission processing unit ignores the uplink grant UL grant indicated to the HARQ entity in the RAR Uplink transmission.

According to the terminal device of the embodiment of the present application, the UL grant indicated to the HARQ entity in the RAR is addressed to the random access wireless network temporary identifier RA-RNTI.

According to the terminal device of the embodiment of the present application, the terminal device further includes: a preamble sending unit, configured to send a random access preamble to the network device in response to a non-competitive random access process triggered by the network device; an RAR receiving unit, Used to receive the RAR sent by the network device; the preamble determination unit is used to determine the random access preamble identifier in the RAR received by the RAR receiving unit and the random access preamble sent by the preamble sending unit to the network device The index of the preamble corresponding to the code is consistent.

According to the terminal device of the embodiment of the present application, the MAC entity of the terminal device is configured to have a skipUplinkTxDynamic field, and the value corresponding to the field is true.

According to the terminal device of the embodiment of the present application, the terminal device further includes: a control unit configured to prevent the MAC entity of the terminal device from generating a MAC protocol data unit PDU for the HARQ entity.

According to the terminal device of the embodiment of the present application, the data to be transmitted uplink includes: uplink data, MAC CE, and/or padding data that the terminal device needs to send.

In a fourth aspect, an embodiment of the present application also provides a terminal device, the MAC entity of the terminal device is configured to have a skipUplinkTxDynamic field, and the value of the field is true; wherein, the terminal device includes: a control unit for In the random access process initiated by the PDCCH order whose random access preamble index is not zero, when the UL grant indicated to the HARQ entity is addressed to the RA-RNTI, the MAC entity of the terminal device is not Generate MAC PDU for HARQ entity.

In a fifth aspect, an embodiment of the present application provides a terminal device, including a processor and a memory, the memory is used to store a computer program, the processor calls and runs the computer program stored in the memory, and executes the above Steps of the processing method used for the random access procedure.

In a sixth aspect, the embodiments of the present application also provide a chip, including a processor, configured to call and run a computer program from the memory, so that the device installed with the chip executes the aforementioned random access process Processing method steps.

In a seventh aspect, an embodiment of the present application also provides a computer-readable storage medium for storing a computer program that enables a computer to execute the steps of the processing method for the random access process as described above.

In an eighth aspect, an embodiment of the present application further provides a computer program product, including computer program instructions, wherein the computer program instructions cause a computer to execute the steps of the processing method for the random access process as described above.

In a ninth aspect, an embodiment of the present application also provides a computer program that enables a computer to execute the steps of the processing method for the random access process as described above.

In a tenth aspect, an embodiment of the present application further provides a communication system, including: a terminal device and a network device, wherein the terminal device is used to execute the steps of the processing method for the random access process as described above.

In the embodiment of the application, by canceling the uplink transmission in the qualified non-competitive random access process, it is possible to reduce unnecessary uplink transmission interference without affecting the random access process, and to reduce the terminal equipment performance to a certain extent. Consumption.

Description of the drawings

Fig. 1 is a schematic diagram of a communication system architecture according to an embodiment of the present application.

Figure 2 is a schematic flow chart of a competitive random access process in a communication system.

Figure 3 is a schematic flow chart of a non-competitive random access process in a communication system.

Fig. 4 is a flowchart of a method for processing a random access process according to an embodiment of the present application.

Fig. 5 is a flowchart of a method for processing a random access process according to another embodiment of the present application.

Fig. 6 is a schematic structural block diagram of a terminal device according to an embodiment of the present application.

FIG. 7 is a schematic structural block diagram of a terminal device according to another embodiment of the present application.

FIG. 8 is a schematic structural block diagram of a terminal device according to another embodiment of the present application.

FIG. 9 is a schematic structural block diagram of a terminal device according to still another embodiment of the present application.

FIG. 10 is a schematic block diagram of a communication device according to an embodiment of the present application.

FIG. 11 is a schematic block diagram of a chip according to an embodiment of the present application.

Fig. 12 is a schematic block diagram of a communication system according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

The technical solutions of the embodiments of this application can be applied to various communication systems, such as: Global System of Mobile Communication (GSM) system, Code Division Multiple Access (CDMA) system, and Wideband Code Division Multiple Access (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) system , New Radio (NR) system, NR system evolution system, LTE (LTE-based access to unlicensed spectrum, LTE-U) system on unlicensed spectrum, NR (NR-based access to unlicensed spectrum) unlicensed spectrum, NR-U) system, universal mobile telecommunication system (UMTS), wireless local area network (Wireless Local Area Networks, WLAN), wireless fidelity (Wireless Fidelity, WiFi), next-generation communications (5th-Generation) , 5G) system or other communication systems, etc.

Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communication, but also support, for example, Device to Device (Device to Device, D2D) communication, machine to machine (Machine to Machine, M2M) communication, machine type communication (MTC), and vehicle to vehicle (V2V) communication, etc. The embodiments of this application can also be applied to these communications system.

Optionally, the communication system in the embodiments of the present application can be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, can also be applied to a dual connectivity (DC) scenario, and can also be applied to a standalone (SA) deployment. Network scene.

The embodiments of this application describe various embodiments in combination with network equipment and terminal equipment. The terminal equipment may also be referred to as User Equipment (UE), access terminal, subscriber unit, subscriber station, mobile station, mobile station, and remote. Station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc. The terminal device can be a station (STAION, ST) in a WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, and personal digital processing (Personal Digital Assistant, PDA) devices, handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, and next-generation communication systems, such as terminal devices in the NR network or Terminal equipment in the public land mobile network (PLMN) network that will evolve in the future.

As an example and not a limitation, in the embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices. It is a general term for using wearable technology to intelligently design everyday wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. Wearable devices are not only a kind of hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones. Use, such as all kinds of smart bracelets and smart jewelry for physical sign monitoring.

A network device can be a device used to communicate with mobile devices. The network device can be an access point (AP) in WLAN, a base station (BTS) in GSM or CDMA, or a device in WCDMA. A base station (NodeB, NB), can also be an Evolutional Node B (eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, and a network device (gNB) in the NR network Or network equipment in the PLMN network that will evolve in the future.

In the embodiment of the present application, the network equipment provides services for the cell, and the terminal equipment communicates with the network equipment through the transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell, and the cell may be a network equipment (for example, The cell corresponding to the base station. The cell can belong to a macro base station or a base station corresponding to a small cell. The small cell here can include: Metro cell, Micro cell, Pico Cells, Femto cells, etc. These small cells have the characteristics of small coverage and low transmit power, and are suitable for providing high-rate data transmission services.

Figure 1 schematically shows one network device 1100 and two terminal devices 1200. Optionally, the wireless communication system 1000 may include multiple network devices 1100, and the coverage of each network device 1100 may include other numbers The terminal device of this application does not limit this.

Optionally, the wireless communication system 1000 shown in FIG. 1 may also include other network entities such as mobility management entities (Mobility Management Entity, MME), access and mobility management functions (Access and Mobility Management Function, AMF). The application embodiment does not limit this.

It should be understood that the terms "system" and "network" in this article are often used interchangeably in this article. The term "and/or" in this article is only an association relationship describing the associated objects, which means that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, exist alone B these three situations. In addition, the character "/" in this text generally indicates that the associated objects before and after are in an "or" relationship.

In order to clearly illustrate the idea of the embodiments of the present application, first, a brief description of the random access process in the communication system is given. Figures 2 and 3 respectively show schematic diagrams of a competitive random access process and a non-competitive random access process in an NR system.

For the competitive random access process shown in Figure 2, the general steps are as follows:

First, the terminal equipment UE sends the first step message (Msg1).

Specifically, the terminal device selects the physical random access channel (Physical Random Access Channel, PRACH) resource, and sends the selected random access preamble (Random Access Preamble) on the selected PRACH time-frequency resource, sometimes referred to as the preamble ( Preamble); Based on the Preamble, the network device, such as the base station gNB, can estimate the size of the uplink grant (uplink grant, sometimes abbreviated as UL grant) required for the terminal device to send the third step message (Msg3).

Secondly, the base station sends the second step message (Msg2).

Specifically, after the terminal device sends Msg1, a window can be opened, and the physical downlink control channel (PDCCH) is monitored in the window. The PDCCH uses the random access radio network temporary identifier (Random Access Radio Network Temporary). Identifier) RA-RNTI scrambling; where RA-RNTI is related to the PRACH time-frequency resource selected by the terminal equipment.

After the terminal device successfully monitors the PDCCH scrambled with RA-RNTI, the terminal device can obtain the physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) scheduled by the PDCCH to receive the random access response (Random Access Response) corresponding to the RA-RNTI. Access Response, RAR).

Among them, the RAR in Msg2 generally has the following characteristics:

① The subheader of RAR includes a backoff indicator (Backoff Indicator, BI), BI is used to indicate the time that the terminal device needs to wait before retransmitting the first step message, that is, the backoff time;

②RAR includes random access preamble identifier (Random Access Preamble Identifier, RAPID), RAPID is the network response to the preamble index Preamble index corresponding to the received Preamble;

③The payload of RAR includes timing advance (Timing Advance of GSM, TAG), and TAG is used to adjust the uplink timing;

④ RAR includes UL grant, which is an uplink resource indication used to schedule terminal equipment to send the third step message;

⑤ RAR includes temporary cell RNTI (Temporary Cell RNTI, TC-RNTI), and TC-RNTI is used to scramble the PDCCH of the fourth step message (Msg4).

Again, the terminal device sends the third step message (Msg3).

Specifically, the Msg3 message can inform the base station which event triggers the RACH process. For example, for the initial random access process, the Msg3 can carry the terminal equipment identity (UE ID) and the establishment of radio resource control (Radio Resource Control, RRC) Establishment Cause: For the case of RRC reestablishment, Msg3 can carry the UE ID in the connected state and the Establishment Cause.

Finally, the base station sends the fourth step message (Msg4).

Specifically, since the competitive random access is that the terminal device randomly selects the Preamble for random access, it is possible that different terminal devices select the same Preamble of the same PRACH resource at the same time, which leads to the occurrence of conflicts. On the one hand, Msg4 is used to resolve contention conflicts, and on the other hand, it is used to transmit RRC configuration messages to terminal devices and establish RRC connections.

In the above random access process, if the terminal device does not use a randomly selected Preamble for random access, but uses a dedicated Preamble, for example, a dedicated Preamble allocated by the base station to the terminal device for random access, the terminal device will not communicate with Other terminal devices generate competition conflicts, so there is no need to resolve competition conflicts.

In this field, a random access process in which a dedicated preamble is allocated by a base station is a non-competitive random access process. Referring to Figure 3, the non-competitive random access process roughly includes: first, the base station allocates a dedicated Preamble to the terminal device; secondly, the terminal device sends the Preamble to the base station; then, the base station sends the RAR to the terminal device, and the terminal device advances based on the time in the RAR The amount of TAG is adjusted for uplink synchronization, and the non-competitive random access process ends.

It should be noted that in the non-competitive random access process, except that the Preamble is allocated by the network equipment (rather than randomly selected by the terminal device) and does not require contention conflict resolution, part of the non-competitive random access process is similar to competitive random access. The access process is similar, and in practical applications, problems arise from this. The detailed description is given below.

For example, according to the current processing method, regardless of the non-competitive random access process or the competitive random access process, after the network device receives the Preamble, it schedules the RAR message through the PDCCH scrambled by RA-RNTI and sends it to For terminal equipment, the RAR message includes not only the TAG value and TC-RNTI, but also UL grant. As mentioned above, the UL grant in the RAR is an uplink resource indication for scheduling the terminal device to send Msg3.

In this regard, on the one hand, during the competitive random access process, the terminal device needs to use the UL grant in the RAR to send Msg3, where the Msg3 includes at least a cell RNTI (Cell RNTI, C-RNTI) and a medium access control MAC control unit CE.

On the other hand, in the non-competitive random access process, similar to the competitive random access, the terminal device will use the UL grant in the RAR to send data. The difference is: due to the non-competitive random access process, the terminal After receiving the RAR, the device does not need to send an Msg3 message (such as C-RNTI or MAC CE) to the network device. This is defined as: the terminal device sends the padding data packet to the network through the UL grant, but the padding data packet does not Carry any useful data.

This means that even when the terminal device itself does not have uplink data or MAC CE needs to send, the terminal device still needs to send meaningless data on the UL grant. This processing method not only increases the power consumption burden of the terminal device, but also Unnecessary uplink transmission interference is caused to the system due to the uploading of useless data. It is necessary to optimize the processing method of the current random access process.

To this end, an embodiment of the present application provides a processing method for a random access procedure. Referring to FIG. 4, the method includes:

S101: In a non-contention random access process meeting a predetermined condition, after receiving a random access response RAR, if there is no data to be uplinked for transmission, no uplink transmission is performed.

Using the solution of the embodiment of the present application, in some non-competitive random access procedures, the terminal device may not perform uplink transmission after receiving the RAR, which allows the terminal device to selectively perform uplink transmission or not perform uplink transmission, especially When there is no content that needs uplink transmission, it is determined not to perform uplink transmission, thereby reducing unnecessary uplink transmission interference and saving terminal equipment energy consumption.

In the embodiment of the present application, the predetermined condition may be: the non-contention random access process is initiated by the physical downlink control channel instruction (PDCCH order).

In one embodiment, when the terminal device loses synchronization in the uplink and the downlink data arrives, the base station will trigger the random access process through the PDCCH order, where the PDCCH order may carry a non-zero preamble index Preamble index, indicating that it is dedicated Preamble, then enter the non-competitive random access process.

In another embodiment, the PDCCH order may also carry a preamble index of all zeros. All zeros mean a non-dedicated preamble. At this time, since the terminal device is not allocated a dedicated preamble, it still needs to compete for access, so it enters the competition. Random access process.

In the embodiment of this application, the predetermined condition may be: the non-contention random access process is initiated by the PDCCH order, and the Preamble index indicated in the PDCCH order is not zero.

Specifically, in the non-contention random access process initiated by the PDCCH order, if the preamble index allocated by the terminal device is not zero, the terminal device uses the allocated preamble for non-contention random access. In this process, After receiving the RAR, the terminal device does not need to further uplink the Msg3 message or other messages, which means that if an uplink transmission occurs at this time, it can be determined that the uplink transmission is unnecessary and useless.

Therefore, in the non-contention random access process initiated by the PDCCH order carrying a non-zero Preamble index, the terminal device of the embodiment of the present application has two possible processing methods after receiving the RAR:

method one:

If there is no uplink transmission data to be sent in the terminal device itself, no uplink transmission is performed. In this way, the normal communication of the system will not be affected, and the interference caused by the uplink transmission can be minimized.

Way two:

If the terminal device itself has content that needs uplink transmission, such as uplink data and/or MAC CE to be sent, then uplink transmission is performed to maintain normal communication of the system.

Further, in order to realize the above-mentioned "no uplink transmission", it can be realized by various means. In the embodiment of this application, the MAC entity of the terminal device is configured to have the function of ignoring the uplink transmission (UL skipping) to allow the terminal The device ignores (also can be called: skip, cancel, or prohibit, etc.) the uplink transmission step in some cases.

In the embodiment of this application, for the terminal device configured and enabled with the UL skipping function, in order to achieve the maximum reduction of uplink transmission interference without affecting the normal communication of the system, the HARQ entity is directed to the hybrid automatic repeat request in the RAR. In the indicated UL grant, the terminal equipment will ignore the uplink transmission.

That is to say, in the embodiment of this application, in the non-competitive random access process initiated by the PDCCH order carrying a non-zero Preamble index, after receiving the RAR, the terminal device with the UL skipping function will respond to the HARQ in the RAR. For the UL grant resource indicated by the entity, the terminal device will not perform uplink transmission.

Compared with the previous processing method in which the padding data packet must be uploaded during the non-competitive random access process, the terminal device in the embodiment of the present application actually ignores, skips, or cancels the uplink transmission step here, which can avoid unnecessary Uplink interference can also save power for terminal equipment and help improve the endurance of terminal equipment.

In the embodiment of the present application, the UL grant indicated to the HARQ entity in the RAR received by the terminal device is addressed to the RA-RNTI.

Referring to FIG. 5, it is a block diagram of a flow chart of a processing method for a random access process according to an embodiment of this application, including:

S201: In response to a non-competitive random access process triggered by a network device, the terminal device sends a random access preamble to the network device.

S202: The terminal device receives the RAR sent by the network device;

S203: The terminal device determines that the random access preamble identifier RAPID in the received RAR is consistent with the preamble index corresponding to the random access preamble sent to the network device;

S204: When there is no data to be transmitted in the uplink, the terminal device does not perform uplink transmission.

Specifically, in response to the non-competitive random access process triggered by the network device, after the terminal device receives the Preamble index allocated by the network device, the terminal device sends the corresponding Preamble to the network device, and the network device passes the RA-RNTI after receiving the Preamble. The scrambled PDCCH schedules the RAR and sends the RAR to the terminal device.

Among them, for the terminal device, after sending the Preamble, the RAR sent to itself can be detected by monitoring the PDCCH scrambled by RA-RNTI, and it can be determined that the preamble identifier RAPID in the RAR corresponds to the Preamble sent by the terminal device. The preamble index is the same. In this case, the UL grant indicated to the HARQ entity in the RAR is addressed to the RA-RNTI. For the UL grant indicated to the HARQ entity, when there is uplink data and/or MAC CE to be sent by the terminal device in the embodiment of this application, it performs uplink transmission on the UL grant, and when there is no uplink data or MAC CE to send, Ignore (skip) upstream transmission.

Here, furthermore, according to the previous processing method, even when there is no uplink demand, the MAC entity of the terminal device needs to generate the MAC protocol data unit PDU for the HARQ entity, and after receiving the UL grant indicated in the RAR Perform uplink transmission, for example, send padding data packets on the channel uplink. In the embodiment of this application, in the non-competitive random access process that meets the aforementioned conditions, and in the absence of other uplink requirements, even if the terminal device receives the UL grant indicated in the RAR, the terminal device will not be on the UL grant. Perform uplink transmission, so the terminal device does not need to generate MAC PDU.

Therefore, in order to avoid generating redundant data, the embodiment of the present application further stipulates that the MAC entity of the terminal device does not generate a MAC PDU for the HARQ entity. Among them, regarding MAC PDU, its structure can usually include four parts: MAC header, MAC service data unit SDU, MAC CE, and/or padding. In an implementation manner of the present application, the terminal device does not need to transmit any data upstream, and therefore does not need to fill data, that is, the terminal device does not need to generate padding data as padding, and the padding data generated by the terminal device is zero.

The following describes the specific implementation of the embodiments of the present application based on specific embodiments:

The MAC entity shall not generate a MAC PDU for the HARQ entity if the following conditions are satisfied:

The MAC entity is configured with skipUplinkTxDynamic with value true and the grant indicated to the HARQ entity was addressed to a C-RNTI, or the grant indicated link to the HARQ entity in the configured or up addressed to a RA-RNTI and the Random Access procedure was initiated by a PDCCH order with ra-PreambleIndex different from 0b000000; and

·There is no aperiodic CSI requested for this PUSCH transmission as specified in TS 38.212[9]; and

·The MAC PDU includes zero MAC SDUs; and

The MAC PDU includes only the periodic BSR and there is no data available for any LCG, or the MAC PDU includes only the padding BSR.

In detail, first of all, in this embodiment of the application, the network device can configure preset fields for the MAC entity of the specified terminal device, so that the terminal device has the aforementioned ability to ignore uplink transmission, that is, UL skipping. When the value of the preset field is set to true, the UL skipping function is turned on.

In an embodiment, the preset field is a "skipUplinkTxDynamic" field. When the MAC entity of the terminal device is configured with the "skipUplinkTxDynamic" field and the field value is true, the processing method used in the random access process includes: random access initiated by the PDCCH order whose random access preamble index is not zero. During the access process, if the UL grant indicated to the HARQ entity is addressed to the RA-RNTI, the MAC entity of the terminal device does not generate a MAC PDU for the HARQ entity.

This means that the MAC entity of the terminal device will not generate MAC PDUs for the HARQ entity when the following conditions are met:

The MAC entity of the terminal device is configured to have the "skipUplinkTxDynamic" field, the value of this field is true, and the UL grant indicated to the HARQ entity is addressed to RA-RNTI, and the random access process is based on the random access preamble It is initiated by the PDCCH order whose index is not zero.

The specific settings and implementation manners of the embodiments of the present application have been described above from different perspectives through multiple embodiments. Using at least one of the above embodiments, in the random access process initiated by the PDCCH order whose random access preamble index is not zero, if the terminal device has no uplink data or MAC CE to send, it will be directed to the UL grant indicated in the RAR , The terminal device can skip uplink transmission without generating the corresponding MAC PDU. In this way, it is possible to avoid power consumption of the terminal equipment, and at the same time reduce unnecessary uplink transmission interference caused by uploading useless data.

Corresponding to the processing method of at least one of the foregoing embodiments, an embodiment of the present application further provides a terminal device 100, referring to FIG. 6, which includes an uplink transmission processing unit 110, wherein:

The uplink transmission processing unit 110 is configured to not perform uplink transmission when there is no data to be uplink transmitted after receiving the random access response RAR in the non-contention random access process meeting the predetermined conditions.

Optionally, in the embodiment of the present application, the predetermined condition includes: the non-contention random access process is initiated by the physical downlink control channel PDCCH indicating order.

Optionally, in the embodiment of the present application, the predetermined condition includes: the non-contention random access process is initiated by the PDCCH order, and the random access preamble index indicated in the PDCCH order is not zero.

Optionally, in this embodiment of the present application, the media access control MAC entity of the terminal device is configured to have a function of ignoring uplink transmission.

Optionally, in the embodiment of the present application, that the uplink transmission processing unit does not perform uplink transmission includes: the uplink transmission processing unit ignores the uplink transmission for the uplink grant UL grant indicated to the HARQ entity in the RAR.

Optionally, in this embodiment of the present application, the UL grant indicated to the HARQ entity in the RAR is addressed to the random access radio network temporary identifier RA-RNTI.

Optionally, in the embodiment of the present application, referring to FIG. 7, the terminal device 100 further includes:

The preamble sending unit 120 is configured to send a random access preamble to the network device in response to a non-competitive random access process triggered by the network device;

The RAR receiving unit 130 is configured to receive the RAR sent by the network device;

The preamble determining unit 140 is configured to determine that the random access preamble identifier in the RAR received by the RAR receiving unit is consistent with the preamble index corresponding to the random access preamble sent by the preamble sending unit to the network device.

Optionally, in this embodiment of the present application, the MAC entity of the terminal device is configured to have a skipUplinkTxDynamic field, and the value corresponding to the field is true.

Optionally, in the embodiment of the present application, referring to FIG. 8, the terminal device 100 further includes:

The control unit 150 is configured to prevent the MAC entity of the terminal device from generating a MAC protocol data unit PDU for the HARQ entity.

Optionally, in this embodiment of the present application, the data to be transmitted uplink includes: uplink data that the terminal device needs to send, MAC CE, and/or padding data.

Corresponding to the processing method of at least one of the foregoing embodiments, an embodiment of the present application further provides a terminal device 200. The MAC entity of the terminal device 200 is configured to have a skipUplinkTxDynamic field, and the value of the field is true;

Referring to FIG. 9, the terminal device 200 includes:

The control unit 210 is configured to, in the random access process initiated by the PDCCH order whose random access preamble index is not zero, when the UL grant indicated to the HARQ entity is addressed to the RA-RNTI, make the terminal The MAC entity of the device 200 does not generate a MAC PDU for the HARQ entity.

Using the terminal equipment of the embodiments of the present application, the uplink transmission can be cancelled during the qualified non-competitive random access process, and unnecessary uplink transmission interference can be reduced without affecting the random access process, and to a certain extent Reduce the energy consumption of terminal equipment.

FIG. 10 is a schematic structural diagram of a communication device 600 according to an embodiment of the present application. The communication device 600 shown in FIG. 6 includes a processor 610, and the processor 610 can call and run a computer program from the memory to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 10, the communication device 600 may further include a memory 620. The processor 610 may call and run a computer program from the memory 620 to implement the method in the embodiment of the present application.

The memory 620 may be a separate device independent of the processor 610, or may be integrated in the processor 610.

Optionally, as shown in FIG. 10, the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices. Specifically, it may send information or data to other devices, or receive other devices. Information or data sent by the device.

Wherein, the transceiver 630 may include a transmitter and a receiver. The transceiver 630 may further include an antenna, and the number of antennas may be one or more.

Optionally, the communication device 600 may be a network device of an embodiment of the present application, and the communication device 600 may implement the corresponding process implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, details are not described herein again.

Optionally, the communication device 600 may be a terminal device of an embodiment of the present application, and the communication device 600 may implement corresponding procedures implemented by the terminal device in each method of the embodiments of the present application. For brevity, details are not described herein again.

FIG. 11 is a schematic structural diagram of a chip 700 according to an embodiment of the present application. The chip 700 shown in FIG. 7 includes a processor 710, and the processor 710 can call and run a computer program from the memory to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 11, the chip 700 may further include a memory 720. The processor 710 may call and run a computer program from the memory 720 to implement the method in the embodiment of the present application.

The memory 720 may be a separate device independent of the processor 710, or may be integrated in the processor 710.

Optionally, the chip 700 may further include an input interface 730. The processor 710 can control the input interface 730 to communicate with other devices or chips, and specifically, can obtain information or data sent by other devices or chips.

Optionally, the chip 700 may further include an output interface 740. The processor 710 can control the output interface 740 to communicate with other devices or chips, and specifically, can output information or data to other devices or chips.

Optionally, the chip can be applied to the network device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, details are not described herein again.

Optionally, the chip can be applied to the terminal device in any of the embodiments in Figures 6-9 of this application, and the chip can implement the corresponding procedures implemented by the terminal device in each method of the embodiments of this application. For the sake of brevity, This will not be repeated here.

It should be understood that the chip mentioned in the embodiment of the present application may also be called a system-level chip, a system-on-chip, a system-on-chip, or a system-on-chip, etc.

The aforementioned processor may be a general-purpose processor, a digital signal processor (digital signal processor, DSP), an off-the-shelf programmable gate array (field programmable gate array, FPGA), an application specific integrated circuit (ASIC), or Other programmable logic devices, transistor logic devices, discrete hardware components, etc. Among them, the aforementioned general-purpose processor may be a microprocessor or any conventional processor.

The above-mentioned memory may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (RAM).

It should be understood that the foregoing memory is exemplary but not restrictive. For example, the memory in the embodiment of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM) and so on. That is to say, the memory in the embodiments of the present application is intended to include, but is not limited to, these and any other suitable types of memory.

FIG. 12 is a schematic block diagram of a communication system 800 according to an embodiment of the present application. As shown in FIG. 12, the communication system 800 includes a terminal device 810 and a network device 820.

Wherein, in the non-competitive random access process meeting the predetermined conditions, after the terminal device 810 receives the random access response RAR, if there is no data to be transmitted in the uplink, the terminal device 810 does not perform the uplink transmission.

Wherein, the terminal device 810 can be used to implement the corresponding functions implemented by the terminal device in the above-mentioned method in the embodiment of FIG. 4 or the embodiment of FIG. The corresponding function. For the sake of brevity, I will not repeat them here.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instruction may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instruction may be transmitted from a website, a computer, a server, or a data center through a cable (Such as coaxial cable, optical fiber, Digital Subscriber Line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

It should be understood that in the various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not correspond to the embodiments of the present application. The implementation process constitutes any limitation.

The technical personnel in the field can clearly understand that, for the convenience and conciseness of the description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Covered in the scope of protection of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

A processing method for a random access process, applied to a terminal device, and the method includes:

In the non-contention random access process that meets the predetermined conditions, after receiving the random access response RAR, if there is no data to be transmitted in the uplink, the uplink transmission is not performed.
The method of claim 1, wherein:

The predetermined condition includes: the non-contention random access process is initiated by the physical downlink control channel PDCCH indicating order.
The method of claim 1, wherein:

The predetermined condition includes: the non-contention random access process is initiated by the PDCCH order, and the random access preamble index indicated in the PDCCH order is not zero.
The method according to any one of claims 1-3, wherein:

The media access control MAC entity of the terminal device is configured to have a function of ignoring uplink transmission.
The method of claim 4, wherein:

The not performing uplink transmission includes: the terminal device ignores the uplink transmission for the uplink grant UL grant indicated to the hybrid automatic repeat request HARQ entity in the RAR.
The method according to any one of claims 1-5, wherein:

The UL grant indicated to the HARQ entity in the RAR is addressed to the random access radio network temporary identifier RA-RNTI.
The method according to any one of claims 1-6, wherein the method further comprises:

In response to the non-competitive random access process triggered by the network device, the terminal device sends a random access preamble to the network device;

Receive RAR sent by network equipment;

It is determined that the random access preamble identifier in the received RAR is consistent with the preamble index corresponding to the random access preamble sent to the network device.
The method according to any one of claims 1-7, wherein:

The MAC entity of the terminal device is configured to have a skipUplinkTxDynamic field, and the value corresponding to the field is true.
The method according to any one of claims 1-8, wherein the method further comprises:

The MAC entity of the terminal device does not generate a MAC protocol data unit PDU for the HARQ entity.
The method according to any one of claims 1-9, wherein the data to be transmitted uplink comprises:

The uplink data that the terminal device needs to send;

and / or,

MAC CE;

and / or,

Padding data.
A processing method for a random access process, applied to a terminal device, the MAC entity of the terminal device is configured to have a skipUplinkTxDynamic field, and the value of the field is true;

The method includes:

In the random access process initiated by the PDCCH order whose random access preamble index is not zero, if the UL grant indicated to the HARQ entity is addressed to the RA-RNTI, the MAC entity of the terminal device is not Generate MAC PDU for HARQ entity.
A terminal device includes an uplink transmission processing unit, wherein:

The uplink transmission processing unit is configured to not perform uplink transmission when there is no data to be uplink transmitted after receiving a random access response RAR in a non-competitive random access process meeting a predetermined condition.
The terminal device according to claim 12, wherein:

The predetermined condition includes: the non-contention random access process is initiated by the physical downlink control channel PDCCH indicating order.
The terminal device according to claim 12, wherein:

The predetermined condition includes: the non-contention random access process is initiated by the PDCCH order, and the random access preamble index indicated in the PDCCH order is not zero.
The terminal device according to any one of claims 12-14, wherein:

The media access control MAC entity of the terminal device is configured to have a function of ignoring uplink transmission.
The terminal device according to claim 15, wherein:

The not performing uplink transmission by the uplink transmission processing unit includes: the uplink transmission processing unit ignores the uplink transmission for the uplink grant UL grant indicated to the hybrid automatic repeat request HARQ entity in the RAR.
The terminal device according to any one of claims 12-16, wherein:

The UL grant indicated to the HARQ entity in the RAR is addressed to the random access radio network temporary identifier RA-RNTI.
The terminal device according to any one of claims 12-17, wherein the terminal device further comprises:

The preamble sending unit is configured to send a random access preamble to the network device in response to the non-competitive random access process triggered by the network device;

The RAR receiving unit is used to receive the RAR sent by the network device;

The preamble determining unit is configured to determine that the random access preamble identifier in the RAR received by the RAR receiving unit is consistent with the preamble index corresponding to the random access preamble sent by the preamble sending unit to the network device.
The terminal device according to any one of claims 12-18, wherein:

The MAC entity of the terminal device is configured to have a skipUplinkTxDynamic field, and the value corresponding to the field is true.
The terminal device according to any one of claims 12-19, wherein the terminal device further comprises:

The control unit is used to prevent the MAC entity of the terminal device from generating a MAC protocol data unit PDU for the HARQ entity.
The terminal device according to any one of claims 12-20, wherein the data to be transmitted uplink comprises:

The uplink data that the terminal device needs to send;

and / or,

MAC CE;

and / or,

Padding data.
A terminal device, the MAC entity of the terminal device is configured to have a skipUplinkTxDynamic field, and the value of the field is true; wherein,

The terminal equipment includes:

The control unit is configured to, in the random access process initiated by the PDCCH order whose random access preamble index is not zero, when the UL grant indicated to the HARQ entity is addressed to the RA-RNTI, make the The MAC entity of the terminal device does not generate a MAC PDU for the HARQ entity.
A terminal device, comprising: a processor and a memory, the memory is used to store a computer program, the processor calls and runs the computer program stored in the memory, and executes any one of claims 1 to 11 The steps of the processing method used for the random access process.
A chip including:

The processor is configured to call and run a computer program from the memory, so that the device installed with the chip executes the steps of the processing method for the random access process according to any one of claims 1 to 11.
A computer-readable storage medium for storing computer programs, where:

The computer program causes the computer to execute the steps of the processing method for a random access procedure according to any one of claims 1 to 11.
A computer program product, including computer program instructions, where,

The computer program instructions cause the computer to execute the steps of the processing method for a random access procedure according to any one of claims 1 to 11.
A computer program that causes a computer to execute the steps of the processing method for a random access process according to any one of claims 1 to 11.
A communication system, including: terminal equipment and network equipment, in which,

The terminal device is used to execute the steps of the processing method for a random access procedure according to any one of claims 1 to 11.